content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import io.reactivex.common.Disposable;
  import io.reactivex.common.internal.disposables.*;
  import io.reactivex.observable.*;
  import io.reactivex.observable.observers.SerializedObserver;
  
  public final class ObservableTakeUntil<T, U> extends AbstractObservableWithUpstream<T, T> {
      final ObservableSource<? extends U> other;
      public ObservableTakeUntil(ObservableSource<T> source, ObservableSource<? extends U> other) {
          super(source);
          this.other = other;
      }
      @Override
      public void subscribeActual(Observer<? super T> child) {
          final SerializedObserver<T> serial = new SerializedObserver<T>(child);
  
          final ArrayCompositeDisposable frc = new ArrayCompositeDisposable(2);
  
          final TakeUntilObserver<T> tus = new TakeUntilObserver<T>(serial, frc);
  
          child.onSubscribe(frc);
  
          other.subscribe(new TakeUntil(frc, serial));
  
          source.subscribe(tus);
      }
  
      static final class TakeUntilObserver<T> extends AtomicBoolean implements Observer<T> {
  
          private static final long serialVersionUID = 3451719290311127173L;
          final Observer<? super T> actual;
          final ArrayCompositeDisposable frc;
  
          Disposable s;
  
          TakeUntilObserver(Observer<? super T> actual, ArrayCompositeDisposable frc) {
              this.actual = actual;
              this.frc = frc;
          }
  
          @Override
          public void onSubscribe(Disposable s) {
              if (DisposableHelper.validate(this.s, s)) {
                  this.s = s;
                  frc.setResource(0, s);
              }
          }
  
          @Override
          public void onNext(T t) {
              actual.onNext(t);
          }
  
          @Override
          public void onError(Throwable t) {
              frc.dispose();
              actual.onError(t);
          }
  
          @Override
          public void onComplete() {
              frc.dispose();
              actual.onComplete();
          }
      }
  
      final class TakeUntil implements Observer<U> {
          private final ArrayCompositeDisposable frc;
          private final SerializedObserver<T> serial;
  
          TakeUntil(ArrayCompositeDisposable frc, SerializedObserver<T> serial) {
              this.frc = frc;
              this.serial = serial;
          }
  
          @Override
          public void onSubscribe(Disposable s) {
              frc.setResource(1, s);
          }
  
          @Override
          public void onNext(U t) {
              frc.dispose();
              serial.onComplete();
          }
  
          @Override
          public void onError(Throwable t) {
              frc.dispose();
              serial.onError(t);
          }
  
          @Override
          public void onComplete() {
              frc.dispose();
              serial.onComplete();
          }
      }
  }
  